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How to tell which ports are in use?

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In article <hsbsl.8960$%(E-Mail Removed)>, Removed)
> *WARNING* Do NOT follow any advice given by the people listed below.
> They do NOT have the expertise or knowledge to fix your issue. Do not waste
> your time.
> David H Lipman, Malke, PA Bear, Beauregard T. Shagnasty, Leythos.

Chris, Stalking on the internet is a crime, your signature indicates you
are a sick individual stalking myself as well as others, you have
warned, again.

Leythos - (E-Mail Removed) (remove 999 to email me)
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Desk Rabbit
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DeanB wrote:
> On Mar 6, 12:58 pm, Desk Rabbit <(E-Mail Removed)> wrote:
>> DeanB wrote:
>>> On Mar 6, 4:40 am, Desk Rabbit <(E-Mail Removed)> wrote:
>>>> DeanB wrote:
>>>>> On Mar 4, 12:23 pm, Desk Rabbit <(E-Mail Removed)> wrote:
>>>>>> DeanB wrote:
>>>>>>> I'm trying to connect a bunch of cameras to a (Linksys WRT54) router,
>>>>>>> and see them from my office. Aside from randomly choosing different
>>>>>>> port numbers until each one works, is there a way to see which port
>>>>>>> numbers are free? For example, 81 was ok, 8081 and 8080 are ok, but 82
>>>>>>> and 83 appear to have some conflict (though still work).
>>>>>>> Many thanks!
>>>>>> Reading between the lines and patching in the missing information I
>>>>>> think you are saying the following:-
>>>>>> You have several IP cameras on private IPs behind a NAT router with a
>>>>>> single public IP.
>>>>>> To access each camera's web interface remotely via the single public IP
>>>>>> you need to map various ports such as 80,81,82,83,84 to port 80 on the
>>>>>> internal IP of each camera. For example:-
>>>>>> 81 -
>>>>>> 82 -
>>>>>> 83 -
>>>>>> You are finding that you get an error message when you try to open
>>>>>> certain ports (Although you don't say what or where).
>>>>>> You also fail to tell us what cameras you are using so I can't
>>>>>> investigate the manuafacturers site for information on how one might do
>>>>>> this.
>>>>>> Firstly I'd set up a VPN if possible and then connect directly to the
>>>>>> IPs. Secure and simple.
>>>>>> What services do you have open already on the router for ports 82 & 83?
>>>>> Hi and thanks for the information!
>>>>> Here are a few answers and maybe some more Q's:
>>>>> I have:
>>>>> 1xPanasonic NP1004 on, works fine.
>>>>> 1xPanasonic BLC131 on, works fine.
>>>>> 1xPanasonic BLC111 on, works fine.
>>>>> 1xPanasonic BLC111 on, works fine (though flashing
>>>>> amber, some kind of network conflict not sure - manual is not useful).
>>>>> and now:
>>>>> 1xPanasonic NS202A currently on, but its not
>>>>> accessible from my office.
>>>>> I can test this easily enough (without travelling) because I have
>>>>> gotomypc installed on my office PC so I can log on to there and log on
>>>>> back to my cameras, all from home.
>>>>> So, all the programs I tested below give me the ports open on one
>>>>> machine, but not my cameras. Not sure how this helps me though.
>>>>> Here is a snapshot of my router's ports:
>>>>> I have a bunch of other servers, an ooma, and other stuff on the
>>>>> router, but I don't need to access them from outside my local network.
>>>> I've had a look at the router manual and I have to say it is a shite
>>>> router. The NAT facility is broken and is useless for the application
>>>> you are trying to use it for.
>>>> This is how I'd do it.
>>>> Each camera should have it's own unique fixed IP and the internal web
>>>> server should be left on port 80.
>>>> Using a router that does proper NAT you would open port 8081 to port 80
>>>> on, port 8082 to port 80 on etc. etc. etc.
>>>> From inside all the camera are accessible via their IP without changing
>>>> the port number. From outside you will attach to the public IP and
>>>> append the port you need for the camera.
>>>> This will work.
>>>>> Q: I've never set up a VPN, can you recommend me a stable and simple
>>>>> one to start with?
>>>> Buy a server.- Hide quoted text -
>>>> - Show quoted text -
>>> Thanks again, I'm beginning to understand something.
>>> Isn't that the way the router is set up right now? For example port 82
>>> is being forwarded to IP

>> No. That is completely different.
>>> The only thing I did different is I set the port number to 82 on the
>>> camera itself - if I understand correctly I should leave it as 80?

>> Yes leave the camera on 80 and open different ports on the outside to
>> map to port 80 on the different IPs inside. That is how standard NAT
>> works. Unfortunately your crappy router is limited and won't allow you
>> to do that.
>>> Oh - for the VPN server you mention - are you talking about a machine
>>> or a software package?

>> A machine. If you had to ask you need to seek a professional.- Hide quoted text -
>> - Show quoted text -

> I am seeking a professional
> So what is my router meaning then, when it says port range 82 to 82 is
> assigned to some IP address? You're saying we need a way to convert a
> port to an IP address, isn't this doing just that?

No, it's doing ranges and not what you need. Just put your hand in your
pocket and pay someone who knows what they are doing. Newsgroups are
great if you have a vague idea what you are doing and need a nudge in
the right direction. If you don't have a clue then a newsgroup is a
dangerous place to seek advice.
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